Conor McGregor and Nate Diaz in August 2016. Steve Marcus / Getty Images Irish UFC fighter Conor McGregor has raised the prospect of a third fight with bitter opponent, Nate Diaz, as rumours about his match-up with Floyd Mayweather rumble on.

McGregor labeled the rivalry with jiu-jitsu black belt Diaz as "a great chapter" in his life in a tweet on Monday.

Stockton southpaw Diaz sent shockwaves through the UFC when he beat McGregor with a rear-naked choke submission victory at UFC 196 in March, 2016.

The loss was McGregor's first in the UFC and snapped a six-year win streak that included five successive performance of the night awards for wins over the likes of Dennis Siver, Chad Mendes, and Jose Aldo.

Five months later, McGregor secured revenge with a five-round decision win in the Diaz rematch at UFC 202.

Nevada State Commission chairman Anthony Marnell recently claimed that a Mayweather vs McGregor crossover bout would be "hard to not approve" in the State, while reports indicate a boxing rules contest could materialize in time for the summer.